Passing URL parameters into a PDF form

I have a problem to know how to pass a URL parameter into a PDF form, first i created with livecycle designer 8 a dynamic form and its downloaded from server to fill out by USERs, then its submited by clicking email form, then the data is stored in an SQL Server database. After the form is subbmited i downloaded again like administrator the form and finally add another data into fields, but i need to get the previous information filled by USERs. How i do that? Which is the command to retrived that info.. i think in passing the autonumeric field in the database in the URL and get the correct form, it´s mean fill dynamically with the ID. Please Help me.